Serious EFI Tuning.... (1 Viewer)

[alkaline747trio]

Warning, link to sChat...possible 35%

https://forum.ih8mud.com/seriously-ot/243187-serious-tuning.html

For those not wanting to join sChat, basically I want to get to know and learn to tweak and tune my 3FE, more specifically it's FI system. I'm wanting to add NOS, but feel to do that I need to learn more about the engine so I don't blow it up.

I'm not throwing much money at this, and am not looking to get large gains....mainly I am seeking knowledge for future possibilities. I also don't want to go all new with the electronics (like the Aussie guy with the 2FT-E).

I'm looking to install an A/F meter on a wideband O2 to be precise and to get a solid baseline.

Any good places on the net, forum or not, to read and learn more about this and things related?

 

[Moby]

I highly recommend both editions of Jeff Hartman's Fuel Injection: Installation, Performance Tuning, Modification.

Amazon.com: Fuel Injection: Installation, Performance Tuning, Modification (Motorbooks International Powerpro): Jeff Hartman: Books (first edition)

Amazon.com: How to Tune and Modify Engine Management Systems (Motorbooks Workshop): Jeff Hartman: Books (second edition)

I own both and have read each cover to cover. These two are the basis for all of my understanding of fuel injection and are the best practical/greatest technical depth EFI books that I have found (I love to read and I'm constantly on the look out for books in this field). I'm sure that there may be better more specialized books but if you want to understand the design factors for EFI systems and how to hotrod them start with Hartman's books.

The first edition is slightly more entry level (but still plenty detailed), is closer to the state of EFI systems when our 3FEs were built, and leans towards building for natually aspirated performance. As such it spends more time talking about sensors, intake profiles, heads and cams.

The second edition is more current and has some interesting insight into the process of actually modifying Toyota ECUs of our vintage (detailed on a massively moddified/boosted turbo MR2 but the chip modification process is the same). However overall the book is more biased towards boosted motors.

As a side note I think that the best option for serious control over your stock 3FE ECU is a good piggyback/Interceptor such as Unichip. Of course you need a Unichip dealer that has a dyno and is an experienced tuner (I have one of these local to me that I've talked to a couple of times but haven't felt the need to go this route yet). Another option would be an AFM to MAF conversion from Split Second. This doesn't give you timing control but it would eliminate the flapper door AFM restriction and give you control over how much air is reported to the stock ECU. Again, I haven't felt the need to go here but this appears to be a viable option based on the research I did.

Good luck finding any company that will do a 3FE ECU (Hartman's 2nd edition goes into great detail describing what is required for an ECU like ours - it is not a plug and play like similar era GM TPI ECUs). I've talked to Techtom and they said no. Jet will but they will only use their new base maps (at first they gave me one story, or a partial story, about what they would do but later retracted/restated that they don't really do custom 3FE tuning, just their base maps and maybe some minor tweaking from there).

 

[agent orange]

I dont think there would be more than 5% in power output to be gained by spending an inordinate amount of time tuning a 3fe. To the best of my knowledge, you have an internally stock 3fe, and i see no reason that you would need to screw with a good factory efi system. And since as far as i know at wot the 02 sensors arent affecting the mixture, then just hook up a wet nitrous jet in the intake tract and let her rip.

 

[alkaline747trio]

This is also a test to see if a de-smog puts the cruiser into a slightly lean condition (which does seem to be the case), and if so I should then be able to fix that issue via Serious EFI Tuning....

 

[Moby]

I dont think there would be more than 5% in power output to be gained by spending an inordinate amount of time tuning a 3fe. To the best of my knowledge, you have an internally stock 3fe, and i see no reason that you would need to screw with a good factory efi system. And since as far as i know at wot the 02 sensors arent affecting the mixture, then just hook up a wet nitrous jet in the intake tract and let her rip.

I would agree if the engine is stock, I took the goal of the thread to mean engine mods plus EFI tuning - sounds like that isn't the goal. If the engine is stock and is going to remain so just dial in a few more degrees of timing (exact amount depends on the octane you want to run) and call it good.

 

[alkaline747trio]

My Threads Are Useless.....